Window lock



June 10, 1958 o. L. WROUGHTON WINDOW LOCK Filed April 17, 1956 INVENTOR. Olirgr- L. Wroughlon. BY-

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United States Patent WINDOW LOCK Oliv er L. Wroughton, Kansas City, Mo. Application April 17, 1956, Serial No. 578,663

2 Claims. (Cl. 70-90) This invention relates to a window lock, and more particularly to a lock for attachment to the upper window casing to prevent or limit movement of the lower casing with respect thereto.

Heretofore, various forms of locks or fastening devices have been devised to prevent the raising of the lower sash of a window to prevent burglary or forcible entry, but such devices have not proven satisfactory due to the complicated structure thereof or the possibility of being tampered with to make them satisfactory in use.

It is the principal object of the present invention to provide a device which may be fastened to the side sash of the upper window whereby the lower window sash will strike against such lock to prevent or limit raising thereof without destruction of the lock when the lock is in position without the use of a key.

Other objects of the present invention are to provide a plate on the upper window sash in spaced relationto the lower window sash having a threaded opening therein adapted to receive the threaded end of a shaft of a locking device; to provide a housing for the locking device to prevent entry to the locking shaft; to provide a key engageable with said locking shaft for securing the shaft to the plate on the upper window sash; to provide said shaft with a collar for engaging a bushing in the end of said housing to prevent removal of the housing without removal of the shaft; and to provide a device of this character simple and economical to manufacture.

In accomplishing these and other objects of the present invention, I have provided improved details of structure the preferred form of which is illustrated in the accompanying drawings, wherein:

Fig. 1 is a perspective view of my invention shown attached to a window sash.

Fig. 2 is a perspective view of the parts of the device in disasesmbled relation.

Fig. 3 is an enlarged cross sectional view of the housing and locking shaft taken on a line 33, Fig. 1.

Referring more in detail to the drawings:

1 designates a window casing or frame having an upper sash 2 and lower 3 slidable in the casing of the casings which is the usual practice. Fastened to the side member 4 of the upper sash near the bottom thereof is a plate 5 of my locking device having openings 6' and 7 for screws of the like 8 and 9 for fastening the plate to the sash. Located near the center of the plate is a threaded opening 10 and if desired the sash may be provided with a threaded bore as indicated at 11 aligning with the threaded opening 10. A locking shaft 12 is provided having one end reduced or offset as indicated at 13 and threaded as indicated at 14 for engaging in the threaded plate opening 10 and extending into the window sash. The shaft 12 is provided with a collar 15 and spaced from the collar and extending through the shaft is a pin 16 or if desired nibs on either one or both of the sides may be used in place of the pin.

A hollow tubular member 17 is provided for engagement over the shaft and has one end internally 'ice threaded as indicated at 18 adapted to receive a threaded bushing 19 rotatable on the reduced portion 13 of the shaft 12 for engaging the collar 15 when the threaded end of shaft 14 is fully engaged in the plate opening. The opposite end of the housing has an inwardly extending flangeto form a stop member for engaging collar 15 and defines a reduced opening 20 through which the shank 21 of a key member 22 having a bifurcated end 23 is adapted to be inserted and engage the nib or pin 16 for rotating the shaft 12 for insertion of the shaft in the opening 10 of the plate 5.

In assembling the lock after the plate is mounted on the upper sash of the window the keyed end of of the shank 12 is inserted through the threaded end of the housing 17 and the bushing engaged over the threaded end 14 of the shaft and threaded into the threads 18 of the housing so that the bushing will engage against the shoulder 24 of the collar 15. The threaded end 14 of the shaft is then inserted in the opening 10 of the plate 5 and turned and rotated by the key 22 by connection of the bifurcated end 23 to the nib or pin 16 until it is tightened. The key is then removed and the lock remains in operative position. It willbe obvious that the housing will rotate on the shaft but will not loosen the shaft 12. The housing prevents entry to the shaft 12 in any manner to loosen the same without the key 22. The housing 17 is of such diameter that it will also cover the heads of the screws 8 and 9 in the plate 5 and thereby preventing loosening of the same, as indicated at 25 in Fig. 1.

It will further be obvious that the plate 5 may be placed any desired distance on the side member 4 of the upper sash to limit the movement of the lower sash with respect to the upper sash and thus regulate the opening underneath the lower sash. The locking device acting as a stop for the lower sash so that the window may be raised to allow air to enter the room but still lock the window against further opening and prevent burglary or other entries through the window.

What I claim and desire to secure by Letters Patent is:

l. A device for limiting movement of the lower sash of a window with respect to the upper sash having a side member comprising, an anchor member secured to the side member of the upper sash in spaced relation to the lower sash, said anchor member having a threaded opening in substantially the center thereof, a housing, a shaft having one end olfset and threaded and slidable longitudinally in said housing, a collar substantially at the center of said shaft, said housing having an open end and said open end being internally threaded and the other end flanged inwardly forming a stop member for said collar at said other end with an opening in the center thereof, and a threaded bushing rotatable on said shaft adjacent the threaded end thereof for engaging the threads in said housing and abutting against said collar at said open end to define an elongate compartment between said bushing and stop member, the threaded end of the shaft being threaded into the threaded opening of the plate whereby said shaft will be slidably enclosed within the housing and said housing extend over the lower sash to limit upward movement thereof.

2. A device for limiting movement of the lower sash of a window with respect to the upper sash having a side member comprising, a plate member, means for securing the plate member to the side member of the upper sash in spaced relation to the lower sash, said plate member having a threaded opening in substantially the center thereof, a housing, a shaft having one end offset and threaded and slidable longitudinally in said housing, a collar substantially at the center of said shaft and spaced from the threaded end thereof, said housing having an open end and said open end being internally threaded & and the other end flanged inwardly forming a stop memher for said collar at said other end with an opening in the center thereof to provide access to said shaft, a threaded bushing rotatable on said shaft adjacent the threaded end thereof for engaging the threads in said housing and abutting against said collar at said open end to define a compartment between said bushing and stop member, and means for rotating said shaft to thread the shaft into the threaded opening of the plate whereby said shaft will be slidably enclosed within the housing and said housing extend over the lower sash to limit upward movement thereof.

UNITED STATES PATENTS Bulkley Nov. 21, Anderson June 20, Brown June 28, Busby Oct. 22, Lesser Dec. 17, Valentine July 24,

FOREIGN PATENTS Great Britain Jan. 19, 

